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The Arachnids were originally believed to be mindless creatures. When Johnny Rico and Carmen Ibanez dissect Arkellian sand beetles, the biology teacher states that the Arachnids have millions of years of evolution behind them and are, in the case of survival capability, the perfect species. They have the ability to colonize planets "by hurling their spore into space" and possess a social structure which fits their mental capabilities.

As the Arachnid War progressed, it became clear that they have a caste system, with each subspecies filling a specific role. Brain Bugs and God Bug have extreme psychic abilities that can be used to control all bugs in the colony.

As the United Citizen Federation expanded its territory across the Galaxy, it came into contact with the Arachnid Species covering an area of it. The Federation initially considered the Arachnids to be a less advanced civilization. However, to avoid conflict, the region of space the Arachnids had colonized was Quarantined to prevent any humans settling within it. Despite this, unofficial colonies were created on Arachnid planets, often ending in the Arachnid attacks of these poorly defended colonies leading to massacres, such as at Port Joe Smith. In response to these intrusions into Arachnid colonies, the Arachnids launched an Meteor Attack on Buenos Aires.

The Arachnids are an alien species that has conquered and colonized many planets across the galaxy. The Arachnids are first discovered on Pluto which led to a large battle against SICON forces. After The Pluto Campaign it was discovered that the Arachnids were actually an interstellar race covering much of the galaxy. It is also known that they will not stop their war against the humans until they are all destroyed.

In the Miniatures Game, SICON Military Intelligence believes the Arachnid Empire is a bio-engineered race created to serve as the military of a different alien species, similar to the Zentraedi from Robotech.